Inverting a selection

Players will already be familiar with the technique of tapping a sum value to select the squares between two blocks. A second tap now inverts the selection and selects the squares outside the blocks. This makes it possible to apply updates to all the squares outside the blocks simultaneously, in the same way as it works for the squares between the blocks when these are selected together.

Inverting a selection can help to speed up play, for example:

• It makes it a little easier to set the remainder value when just one square gets left over, such as, setting 1 on the last square when the sum is 14 in a 7x7 puzzle.
• It also makes it easier to eliminate values from the squares outside the blocks, such as, removing 1 from the squares outside the blocks in a 7x7 puzzle when a sum of 8 uses 3 squares.

Inverting a selection is the main change in version 1.39.0. Also in this version:

• In Random Play, the mode used to generate a puzzle is shown on the outcome page.
• Back buttons have been made more responsive.

A small problem with inverted selections was identified in version 1.39.0. The inverted selection was not working correctly when applied to a row with a single square between the blocks. This issue has been fixed in version 1.39.1.